Mortise lock



April 28, 1936. 1 JAMBRlcl-l MORTI'SE LOCK- Filed Nov. 13, 1934.

/Z ,5x 50 a/ Patented Apr. 28, 1936 MORTISE LOCK Lorenz Jambrich, South Bend, Ind., assignor of one-third to Peter Grabner, South Bend, Ind.

Application November 13, 1934, Serial No. '752,870

2 Claims. (Cl. 70-`14) UNITED STATES PATENT oFFlcE This invention relates to the class of locks and nerlizains particularly to a key operated'mortise The primary object of the present invention is to provide a key operated lock which is so designed that a certain manipulation of the key in the lock is necessary to effect the actuation of the same, which must be known in order to operate the. lock so that an unauthorized person in possession of the key and not knowing the manipulative movements necessary, would not beA successful in actuating the lock to disengage the same from a keeper.

A further object of the invention is to provide a lock of the above described character which is of relatively simple design and which is so constructed that a key inserted by a person not knowing the Vproper manipulation of the same can be freely turned in either direction without giving any hint to the user as to its proper use.

'I'he invention will be best understood from a consideration of the following detailed description taken in connection with the accompanying drawing forming part; of this speciiication, with the understanding, however, that the invention is not confined to any strict conformity with the showing of the drawing but may be changed or modied so long as such changes or modications mark no material departure from the salient features of the invention as expressed in the appended claims.

In the drawing:

' Figure 1 is a vertical sectional view through the lock structure and keeper embodying the present invention, the section being taken substantially upon the line I-I of Figure 3.

Figure 2 is a sectional view taken upon the line 2-2 of Figure 1. Y

Figure 3 is a sectional view taken upon the line 3-3 of Figure 1.

Referring to the drawing, the numeral I indicates a portion of a door or other body in which the lock may be mounted While the numeral 2 indicates a portion of a jamb or other structure with which the door or body I is associated. While the present lock is designed for use upon any type of closurewhere one surface is moved toward and into abutting relation with the other, it will be assumed that the present illustration is of a sliding door which has its vertical edge moved toward or away from the face of a jamb.

In the forward face of the door body I, the usual mortise. 3r is formed to receive the lock structure which comprises a housing 4 which is relatively shallow, and which comprises one wall plate 5 having the side walls 6 integral therewith, and a removable face plate 1 which is brought into abutting relation with the edges of the side walls to close the housing, as illustrated in Figures 2 and 3. One of the side walls of the housing is extended to one side of the casing to form the attaching flange plate 8 which is secured by screws 9 or in any other suitable manner to the edge of the door body in which it is countersunk, as shown in Figure 3.

The Wall of the housing ofl which the plate 8 forms an extension, is provided with an opening I0, through which a, keeper yoke I I extends when the plate 8 is brought into abutting relation with the keeper plate I2' which is countersunk in the face of the jamb 2.

Within the housing 4, the xed or back wall 5 thereof has secured thereto the pair of alined guide strips I2 and I3. These strips are in spaced relation and disposed upon opposite sides of the opening I0, as shown in Figure l, and the strip I3 has a lateral extension or head I4 which constitutes a stop for the purpose hereinafter described.

Disposed against the wall 5 is a bolt plate I5 which at eachend has a flange I6 formed thereacross which is provided with a transverse slot I'I to receive the adjacent guide rib I 2 or I3. These anges I6 actually contact the wall 5 to maintain the main body portion of the plate I5 in spaced relation therewith, the opposite side of the body being disposed against the inner face of the cover plate 1, as illustrated in Figures 2 and 3. The edge of the plate l5, which is drected toward the opening I Il, is cut away to form the locking bolt I8 which is cut obliquely to form the beveled surface I9 with which lthe keeper yoke I I comes into contact when the door is moved to closed position. The point of this bolt I8 normally extends across the opening I0 and is designed to extend through the yoke II, as shown in Figure 1, to maintain the door locked against movement.

The plate l5 carries a pin 2U on which is swung between the wall 5 and the plate I5, the pointed finger 2| which constitutes a thrust finger in the actuation of the lock. Secured to the inner side wall 6 of the casing is a split annular spring 22, the two ends of which are turned outwardly slightly, as indicated at 23, and are directed toward the inner edge of the bolt plate I5 to receive therebetween the pointed end of the thrust linger 2|. Concentrically with thisV spring 22, there is xed in the back wall 5 of the housing, a guide pin 24, and thecover plate 'I has a key hole aperture from which extends inwardly to the opposite wall of the casing, the; sleeve 25Y vided with a socketto *receive the pin 24, andY extending 4laterally from this inner end is an arcuate web 2'I which adjacent its outer edge has a'transverse notch 28 formed therein upon Ythe concave face; and the saidV outer edge o'f` the key is relatively Wide androunded, as indicated at 29, and the web extends from thev key shaft I 26 a distance substantially-equal to the interior Vradius of the/annular spring 22; i

A leaf spring 30 is xed at one end toca post Y 3| carried upon the wall 5 of the lock housing and hasitsother' end bearing against'an end of the lock bar pla-te I5, as indicated `at 32,7t'o conr- Ystantly urge' this platein a direction to locate thek end of the bolt I8 across the openingV ID. It will thus be seen that the bolt is YVconstantly in a' position tofbe engaged by the keeperyoke I I and can only be removed from this position by manipulation of the key; Y J

- In theoperation of the present lock, when the web-of the key is inserted to position within the split annular spring 22, it may be rotated within thisspring, and as will be readily apparent,r it

Y 4A-51 rotated so as to force the thrust linger in the dithe yoke II.

can be `freely turnedV completely around and as many times as desired, in. either dir'ectionlv In Aorder to properly manipulate the keyfo'r the `actuation of the lock, it is necessary to turn it in one direction onlyl'in the present instance, in a clockwisevdirection, to cause the pointed end of the'thrust ng'er 2| to ride overethe rounded L edge 25 anddrop into the groove 28'.V Whenthisf position is reached, the turning-of the key in a clockwise direction must be/instantl'y stopped so that the'point VofV the thrust finger will not slip ,out of the-groove 28 and the key reversely rection opposed tothe thrust of the-spring 30,

and thus effect the sliding of the plate I5-andv the bolt I8 Which forms an integral part thereof in the proper direction tov remove the. bolt from VIt will Vbe apparent that as Soonas .the key reaches a certain position in'i'ts arcuate path, the pointed end of the thrust 1inger2Y I will slip out of the groove 28V and ride back over the edge 29 and be forced back to its normal position by the closing up of the split annular spring 22 and at the same time, 4the spring Y3|] will eiect Ythe immediate return of the bolt -I8 to its position across the openingV Ill, so that if the door I is then closed, the bolt will snap intoV engagement with the yoke II and secure the door.

It Vwill be apparent from the foregoing that in the present lock, the key" does not have to be reversely rotated during the unlocking operation in order to disengage it from the thrust finger 2 I, and also it will be apparent that it can be freely turned in eitherV a clockwise or counterclockwise direction so thatthe possibility of Ya person who has thejkey without` knowing how :to` properly manipulate it, finding out which is the proper direction to turn the key, is eXtremely remote.v Y Y Whatis claimed is:-

1. In a lock for use with a key having a stem and,` a notched web, a sliding'bolt, means resiliently urging the bolt to one positionY for enfgagement with a keeper, a pointed thrust iing'er oscillatably connected with the bolt, a split annular spring xed adjacentl to and in the plane of the`boltY and'having the pointed end of said nger extended thereinto between its'ends, the` ends of the split spring constantly engaging opposite sides of said finger, and means for intro-Y n ducing the key web into the casing comprising a key opening which is concentric with the annular spring.

`2.'In a lock for use with a key having a stem and notched web, a4 relatively atr casing' having r an opening thru one edge Wall, a bolt disposed within the casingV and having a portion adaptedv to move Vacross said opening, said bolt having' transverse websv extending from one end and! having'slidin'g contact with the sidewall of the casing,V each of said webs having a slottransversely thereof,V a rib carried `by said side` wall of the casing adjacent each'web and engaging inV the slot thereof, a pointed finger pivotally attached to thebolt upon one side and between said webs and projecting beyond-a longitudinaledg'e of the bolt, an kannular spring disposedy in the Y Vcasing adjacent said longitudinal edge of the bolt and in the plane of thebolt, and split transversely to receive the pointed end of said iinger, and

spring means normally urging said bolt in one di-,

rection, said casing having an opening. in one side wall concentric with the spring for the reception of said key. Y i K Y il LORENZ JAMBRICH. 

